基于TDR技术的多种岩土介质含水量试验研究  

Measurement of Water Content of Multiple Geomaterials by Time-Domain Reflectometry Technique

作　　者：陈赟[1] 陈云敏[1] 周群建[2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学建筑设计研究院,浙江杭州310027

出　　处：《西南交通大学学报》2011年第1期42-48,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(50538080)

摘　　要：为寻求适合多种岩土介质含水量的测试方法,根据极化机理,建立了电磁波与混合介质相互作用模型,采用TDR(time-domain reflectometry)方法对粉土、砂土、粘土、纸、塑料、有机物及MSW(municipal solid waste)等多种岩土介质介电常数与材料类型、孔隙率及含水量之间的关系进行研究.结果表明,不同岩土介质的介电常数主要由其含水量及孔隙率决定,受介质类型的影响很小,本文模型对不同类型不同孔隙率的岩土介质均适用;介电常数的平方根与体积含水量呈线性关系,相同体积含水量条件下,介质介电常数与孔隙率负相关.TDR技术能在不破坏有机质的前提下测得有机质内部的水分.In order to find a suitable method for measuring the water content of multiple geomaterials,an interaction model between electromagnetic wave and mixed media was built based upon polarization mechanism.The relationships between dielectric constant and each of material,porosity,and water content of multiple geomaterials including silt,sand,clay,paper,plastic,organics,and municipal solid waste were studied by time-domain reflectometry（TDR） technique.The results show that the dielectric constant of different geomaterials is mainly determined by its water content and porosity,and slightly influenced by its material type.The theoretical model proposed is suitable for geomaterials with different material type and porosity.In addition,the square root of dielectric constant is in good linear relationship with volumetric water content.The dielectric constant of geomaterial has a negative correlation with its porosity under the same volumetric water content.Furthermore,the water content of organics can be measured by TDR technique nondestructively,which provides an experimental basis for the use of TDR in landfills.

关 键 词：岩土介质 城市固体废弃物 含水量 室内试验 时域反射法(TDR) 孔隙率 

分 类 号：X833[环境科学与工程—环境工程]